import sys
#sys.setrecursionlimit(10 ** 6)
INF = float('inf')
MOD = 10**9 + 7
MOD2 = 998244353
from collections import defaultdict
def ceil(A,B):
    return -(-A//B)
def solve():
    def II(): return int(sys.stdin.readline())
    def LI(): return list(map(int, sys.stdin.readline().split()))
    def LC(): return list(sys.stdin.readline().rstrip())
    def IC(): return [int(c) for c in sys.stdin.readline().rstrip()]
    def MI(): return map(int, sys.stdin.readline().split())
    T = II()
    for test in range(T):
        N,X = MI()
        if(N*(N+1)//2<=X):
            ans = [i+1 for i in range(N-1)]
            S = sum(ans)
            print(*ans,X-S)
        else:
            print(-1)
solve()